udp IPv6 support, IPv6/IPv4 tunneling support in kernel,

packet divert at kernel for IPv6/IPv4 translater daemon

This includes queue related patch submitted by jburkhol@home.com.

Submitted by: queue related patch from jburkhol@home.com
Reviewed by: freebsd-arch, cvs-committers
Obtained from: KAME project

1 files changed, 311 insertions, 0 deletions

diff --git a/sys/netinet/in_gif.c b/sys/netinet/in_gif.c
new file mode 100644
index 0000000..fd8317f
--- /dev/null
+++ b/sys/netinet/in_gif.c
@@ -0,0 +1,311 @@
+/*
+ * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the project nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+/*
+ * in_gif.c
+ */
+
+#include "opt_mrouting.h"
+#include "opt_inet6.h"
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/socket.h>
+#include <sys/sockio.h>
+#include <sys/mbuf.h>
+#include <sys/errno.h>
+#include <sys/kernel.h>
+#include <sys/sysctl.h>
+#include <sys/protosw.h>
+
+#include <net/if.h>
+#include <net/route.h>
+
+#include <netinet/in.h>
+#include <netinet/in_systm.h>
+#include <netinet/ip.h>
+#include <netinet/ip_var.h>
+#include <netinet/in_gif.h>
+
+#ifdef INET6
+#include <netinet/ip6.h>
+#endif
+
+#ifdef MROUTING
+#include <netinet/ip_mroute.h>
+#endif /* MROUTING */
+
+#include <net/if_gif.h>
+
+#include "gif.h"
+
+#include <machine/stdarg.h>
+
+#include <net/net_osdep.h>
+
+#if NGIF > 0
+int ip_gif_ttl = GIF_TTL;
+#else
+int ip_gif_ttl = 0;
+#endif
+
+SYSCTL_DECL(_net_inet_ip);
+SYSCTL_INT(_net_inet_ip, IPCTL_GIF_TTL, gifttl, CTLFLAG_RW,
+	&ip_gif_ttl,	0, "");
+
+int
+in_gif_output(ifp, family, m, rt)
+	struct ifnet	*ifp;
+	int		family;
+	struct mbuf	*m;
+	struct rtentry *rt;
+{
+	register struct gif_softc *sc = (struct gif_softc*)ifp;
+	struct sockaddr_in *dst = (struct sockaddr_in *)&sc->gif_ro.ro_dst;
+	struct sockaddr_in *sin_src = (struct sockaddr_in *)sc->gif_psrc;
+	struct sockaddr_in *sin_dst = (struct sockaddr_in *)sc->gif_pdst;
+	struct ip iphdr;	/* capsule IP header, host byte ordered */
+	int proto, error;
+	u_int8_t tos;
+
+	if (sin_src == NULL || sin_dst == NULL ||
+	    sin_src->sin_family != AF_INET ||
+	    sin_dst->sin_family != AF_INET) {
+		m_freem(m);
+		return EAFNOSUPPORT;
+	}
+
+	switch (family) {
+	case AF_INET:
+	    {
+		struct ip *ip;
+
+		proto = IPPROTO_IPV4;
+		if (m->m_len < sizeof(*ip)) {
+			m = m_pullup(m, sizeof(*ip));
+			if (!m)
+				return ENOBUFS;
+		}
+		ip = mtod(m, struct ip *);
+		tos = ip->ip_tos;
+		break;
+	    }
+#ifdef INET6
+	case AF_INET6:
+	    {
+		struct ip6_hdr *ip6;
+		proto = IPPROTO_IPV6;
+		if (m->m_len < sizeof(*ip6)) {
+			m = m_pullup(m, sizeof(*ip6));
+			if (!m)
+				return ENOBUFS;
+		}
+		ip6 = mtod(m, struct ip6_hdr *);
+		tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
+		break;
+	    }
+#endif /*INET6*/
+	default:
+#ifdef DIAGNOSTIC
+		printf("in_gif_output: warning: unknown family %d passed\n",
+			family);
+#endif
+		m_freem(m);
+		return EAFNOSUPPORT;
+	}
+
+	bzero(&iphdr, sizeof(iphdr));
+	iphdr.ip_src = sin_src->sin_addr;
+	if (ifp->if_flags & IFF_LINK0) {
+		/* multi-destination mode */
+		if (sin_dst->sin_addr.s_addr != INADDR_ANY)
+			iphdr.ip_dst = sin_dst->sin_addr;
+		else if (rt) {
+			iphdr.ip_dst = ((struct sockaddr_in *)
+					(rt->rt_gateway))->sin_addr;
+		} else {
+			m_freem(m);
+			return ENETUNREACH;
+		}
+	} else {
+		/* bidirectional configured tunnel mode */
+		if (sin_dst->sin_addr.s_addr != INADDR_ANY)
+			iphdr.ip_dst = sin_dst->sin_addr;
+		else {
+			m_freem(m);
+			return ENETUNREACH;
+		}
+	}
+	iphdr.ip_p = proto;
+	/* version will be set in ip_output() */
+	iphdr.ip_ttl = ip_gif_ttl;
+	iphdr.ip_len = m->m_pkthdr.len + sizeof(struct ip);
+
+	/* prepend new IP header */
+	M_PREPEND(m, sizeof(struct ip), M_DONTWAIT);
+	if (m && m->m_len < sizeof(struct ip))
+		m = m_pullup(m, sizeof(struct ip));
+	if (m == NULL) {
+		printf("ENOBUFS in in_gif_output %d\n", __LINE__);
+		return ENOBUFS;
+	}
+
+	*(mtod(m, struct ip *)) = iphdr;
+
+	if (dst->sin_family != sin_dst->sin_family ||
+	    dst->sin_addr.s_addr != sin_dst->sin_addr.s_addr) {
+		/* cache route doesn't match */
+		dst->sin_family = sin_dst->sin_family;
+		dst->sin_len = sizeof(struct sockaddr_in);
+		dst->sin_addr = sin_dst->sin_addr;
+		if (sc->gif_ro.ro_rt) {
+			RTFREE(sc->gif_ro.ro_rt);
+			sc->gif_ro.ro_rt = NULL;
+		}
+	}
+
+	if (sc->gif_ro.ro_rt == NULL) {
+		rtalloc(&sc->gif_ro);
+		if (sc->gif_ro.ro_rt == NULL) {
+			m_freem(m);
+			return ENETUNREACH;
+		}
+	}
+
+#ifdef IPSEC
+	m->m_pkthdr.rcvif = NULL;
+#endif /*IPSEC*/
+	error = ip_output(m, 0, &sc->gif_ro, 0, 0);
+	return(error);
+}
+
+void
+#if __STDC__
+in_gif_input(struct mbuf *m, ...)
+#else
+in_gif_input(m, va_alist)
+	struct mbuf *m;
+	va_dcl
+#endif
+{
+	int off, proto;
+	struct gif_softc *sc;
+	struct ifnet *gifp = NULL;
+	struct ip *ip;
+	int i, af;
+	va_list ap;
+
+	va_start(ap, m);
+	off = va_arg(ap, int);
+	proto = va_arg(ap, int);
+	va_end(ap);
+
+	ip = mtod(m, struct ip *);
+
+	/* this code will be soon improved. */
+#define	satosin(sa)	((struct sockaddr_in *)(sa))
+	for (i = 0, sc = gif; i < ngif; i++, sc++) {
+		if (sc->gif_psrc == NULL
+		 || sc->gif_pdst == NULL
+		 || sc->gif_psrc->sa_family != AF_INET
+		 || sc->gif_pdst->sa_family != AF_INET) {
+			continue;
+		}
+
+		if ((sc->gif_if.if_flags & IFF_UP) == 0)
+			continue;
+
+		if ((sc->gif_if.if_flags & IFF_LINK0)
+		 && satosin(sc->gif_psrc)->sin_addr.s_addr == ip->ip_dst.s_addr
+		 && satosin(sc->gif_pdst)->sin_addr.s_addr == INADDR_ANY) {
+			gifp = &sc->gif_if;
+			continue;
+		}
+
+		if (satosin(sc->gif_psrc)->sin_addr.s_addr == ip->ip_dst.s_addr
+		 && satosin(sc->gif_pdst)->sin_addr.s_addr == ip->ip_src.s_addr)
+		{
+			gifp = &sc->gif_if;
+			break;
+		}
+	}
+
+	if (gifp == NULL) {
+#ifdef MROUTING
+		/* for backward compatibility */
+		if (proto == IPPROTO_IPV4) {
+			ipip_input(m, off, proto);
+			return;
+		}
+#endif /*MROUTING*/
+		m_freem(m);
+		ipstat.ips_nogif++;
+		return;
+	}
+
+	m_adj(m, off);
+
+	switch (proto) {
+	case IPPROTO_IPV4:
+	    {
+		struct ip *ip;
+		af = AF_INET;
+		if (m->m_len < sizeof(*ip)) {
+			m = m_pullup(m, sizeof(*ip));
+			if (!m)
+				return;
+		}
+		ip = mtod(m, struct ip *);
+		break;
+	    }
+#ifdef INET6
+	case IPPROTO_IPV6:
+	    {
+		struct ip6_hdr *ip6;
+		af = AF_INET6;
+		if (m->m_len < sizeof(*ip6)) {
+			m = m_pullup(m, sizeof(*ip6));
+			if (!m)
+				return;
+		}
+		ip6 = mtod(m, struct ip6_hdr *);
+		ip6->ip6_flow &= ~htonl(0xff << 20);
+		break;
+	    }
+#endif /* INET6 */
+	default:
+		ipstat.ips_nogif++;
+		m_freem(m);
+		return;
+	}
+	gif_input(m, af, gifp);
+	return;
+}